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Post by daniel on Nov 5, 2015 0:59:28 GMT -8
Now it is pretty clear to me that a batch box configuration can give a huge amount of heat depending on the system size and of course if everything works well, the second part is how to store this heat and give it back to the areas needed. I have done a lot of research and little experiments of which materials hold heat better and at the same time are readily available. Soapstone is great but maybe expensive, rocks salt are also great, rocks need to be selected since they can explode. Instead of trying to make too many channels which slow the draft down or create too many bells the internal surface area should be kept to an optimum level but find a better way to store and release gradually that heat. I want to involve a few very small electric fans to drive heat through hot air in a bed of rocks and from there to distribute it in other rooms. That would be awesome. While watter will hold heat better rocks or concrete will do it even better for the volume.
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tigra
New Member
Posts: 2
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Post by tigra on Mar 8, 2016 11:12:01 GMT -8
If you are looking for a substance with highest possible specific heat capacity/volumetric heat capacity, then this is water (if you don't consider phase change thermal accumulators). I.e. water tank is the most compact thermal mass to store given amount of heat, and water is easily moved around both using pumps of natural convection. However it has some downsides: it can freeze, leak etc. I leave my home for a long periods sometimes so it can freeze, especially if an event of electric power outage (using electric warm floor and electric convector to keep the house from freezing when I am not at home). That can be fixed by using some antifreeze substances instead of pure water, but they have limited lifespan and thus have to be disposed of safely - another headache. So I am leaning towards solids for now But if you choose water as a medium for storing and transferring heat, take a look on this thread, an interesting heater that relies on water: donkey32.proboards.com/thread/1961/russian-rocket
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Post by mintcake on Mar 22, 2016 10:17:26 GMT -8
Just make sure your water can't boil and that if it does the steam can go somewhere. And then add a couple more safety devices. And then decide not to risk blowing a big hole where your house used to be.
I have no problems with water in a gas fired central heating boiler, since that has an 'in case of overheat, turn off gas' control built in. That's a lot harder with a rocket stove. Also, while water has a high *specific* heat capacity, a big pile of rock/clay/iron at 300C probably has more total capacity, and is freeze/boil proof too.
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